The extraction of copper from pyrites is more difficult than from its oxide ores through reduction because -

1.  Gf of HCl is less than that of H2S and CS2

2. Gf of HNO3 is less than that of H2S and CS2

3.  Gf of Cu2S is less than that of H2S and CS2

4. Gf of CuSO4 is less than that of H2S and CS2

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 75%
From NCERT
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The common elements present in the anode mud in electrolytic refining of copper are -

1. Nitrogen, magnesium, sodium

2. Silver, gold, platinum, and antimony

3. Oxygen, sulphur, lithium

4. Nitrogen, magnesium, oxygen

Subtopic:  Refining Process |
 90%
From NCERT
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The role of silica in the metallurgy of copper is :

1. To remove the iron oxide obtained during the process of roasting as ‘slag’.
2. To remove the sulphur oxide obtained during the process of roasting as ‘slag’.
3. To remove the nitrogen oxide obtained during the process of roasting as ‘slag’.
4. To remove the aluminium oxide obtained during the process of roasting as ‘slag’.

Subtopic:  Refining Process |
 77%
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The term “Chromatography” means -

1. Technique for the preparation of mixtures.

2. Technique for the separation of mixtures.

3. Technique for the separation of ore.

4. Technique for the preparation of aluminium.

Subtopic:  Refining Process |
 84%
From NCERT
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Which of the following statements is true about the refining of nickel?

1. Nickel is heated in the presence of NO2 to form nickel tetracarbonyl.
2. Nickel is heated in the presence of CO to form nickel tetracarbonyl.
3. Nickel is heated in the presence of CO2 to form nickel tetracarbonyl.
4. Nickel is heated in the presence of SO2 to form nickel tetracarbonyl.

Subtopic:  Refining Process |
 87%
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‘Cast iron’ is different from ‘Pig iron' because :

1. Cast iron is obtained by melting pig iron and coke using a hot air blast.
2. Cast iron contains lower amount of carbon (3%) than pig iron.
3. Unlike pig iron, cast iron is extremely hard and brittle.
4. All of the above

Subtopic:  Refining Process |
 86%
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The correct statement among the following is:

1. All ores are minerals, but all minerals are not necessarily ores.
2. Minerals are an economical source of metal
3. Extraction of metal from ores is difficult.
4. None of the above

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 75%
From NCERT
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Copper matte is put in silica lined converter to :

1. Remove the remaining H2SO4 and H2S present in the matte as slag.
2. Remove the remaining MnO and FeS present in the matte as slag.
3. Remove the remaining Fe2O3 and Fe2S present in the matte as slag.
4. Remove the remaining FeO and FeS present in the matte as slag.

Subtopic:  Refining Process |
 58%
From NCERT
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The role of cryolite in the metallurgy of aluminium is :

1. To decrease the melting point of the mixture from 2323 K to 1140 K
2. To increase the electrical conductivity of Al2O3
3. To decrease the electrical conductivity of Al2O3
4. Both '1' and '2'

Subtopic:  Metallurgy of individual elements |
 82%
From NCERT
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Leaching of low-grade copper ores does not involve

1. Cu getting converted into Cu2+(aq) in acidic medium

2. Cu getting converted into Cu2+(aq) in basic medium

3. Cu2+(aq) getting reduced to Cu

4. using bacteria in the presence of air.

 

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 52%
From NCERT
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